Bellu, R. R. & Sherman, H. (1993).
Predicting Entrepreneurial Success from Task Motivatin and
Attributional Style: A Longitudinal Study. Proceedings of the
United States Association for Small Business and Entrepreneurship,
8, 16-23.

Levenson, H. (1972). Distinctions Within the
Concept of Internal-External Control: Development of a New Scale.
Proceedings, American Psychological Association Annual
Convention, 80th Convention, 261-262.

Smith, N. R. (1967). The Entrepreneur and
His Firm: The Relationship Between Type of Man and Type of
Company. East Lansing: Bureau of Business and Economic
Research, Graduate School of Business Administration, Michigan
State University.